xref: /openbmc/linux/arch/mips/sgi-ip27/ip27-klnuma.c (revision 22246614)
1 /*
2  * Ported from IRIX to Linux by Kanoj Sarcar, 06/08/00.
3  * Copyright 2000 - 2001 Silicon Graphics, Inc.
4  * Copyright 2000 - 2001 Kanoj Sarcar (kanoj@sgi.com)
5  */
6 #include <linux/init.h>
7 #include <linux/mmzone.h>
8 #include <linux/kernel.h>
9 #include <linux/nodemask.h>
10 #include <linux/string.h>
11 
12 #include <asm/page.h>
13 #include <asm/sections.h>
14 #include <asm/sn/types.h>
15 #include <asm/sn/arch.h>
16 #include <asm/sn/gda.h>
17 #include <asm/sn/hub.h>
18 #include <asm/sn/mapped_kernel.h>
19 #include <asm/sn/sn_private.h>
20 
21 static cpumask_t ktext_repmask;
22 
23 /*
24  * XXX - This needs to be much smarter about where it puts copies of the
25  * kernel.  For example, we should never put a copy on a headless node,
26  * and we should respect the topology of the machine.
27  */
28 void __init setup_replication_mask(void)
29 {
30 	/* Set only the master cnode's bit.  The master cnode is always 0. */
31 	cpus_clear(ktext_repmask);
32 	cpu_set(0, ktext_repmask);
33 
34 #ifdef CONFIG_REPLICATE_KTEXT
35 #ifndef CONFIG_MAPPED_KERNEL
36 #error Kernel replication works with mapped kernel support. No calias support.
37 #endif
38 	{
39 		cnodeid_t	cnode;
40 
41 		for_each_online_node(cnode) {
42 			if (cnode == 0)
43 				continue;
44 			/* Advertise that we have a copy of the kernel */
45 			cpu_set(cnode, ktext_repmask);
46 		}
47 	}
48 #endif
49 	/* Set up a GDA pointer to the replication mask. */
50 	GDA->g_ktext_repmask = &ktext_repmask;
51 }
52 
53 
54 static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid)
55 {
56 	cnodeid_t client_cnode;
57 	kern_vars_t *kvp;
58 
59 	client_cnode = NASID_TO_COMPACT_NODEID(client_nasid);
60 
61 	kvp = &hub_data(client_nasid)->kern_vars;
62 
63 	KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp;
64 
65 	kvp->kv_magic = KV_MAGIC;
66 	kvp->kv_ro_nasid = server_nasid;
67 	kvp->kv_rw_nasid = master_nasid;
68 	kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid);
69 	kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid);
70 	printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid);
71 }
72 
73 /* XXX - When the BTE works, we should use it instead of this. */
74 static __init void copy_kernel(nasid_t dest_nasid)
75 {
76 	unsigned long dest_kern_start, source_start, source_end, kern_size;
77 
78 	source_start = (unsigned long) _stext;
79 	source_end = (unsigned long) _etext;
80 	kern_size = source_end - source_start;
81 
82 	dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start),
83 					    dest_nasid);
84 	memcpy((void *)dest_kern_start, (void *)source_start, kern_size);
85 }
86 
87 void __init replicate_kernel_text()
88 {
89 	cnodeid_t cnode;
90 	nasid_t client_nasid;
91 	nasid_t server_nasid;
92 
93 	server_nasid = master_nasid;
94 
95 	/* Record where the master node should get its kernel text */
96 	set_ktext_source(master_nasid, master_nasid);
97 
98 	for_each_online_node(cnode) {
99 		if (cnode == 0)
100 			continue;
101 		client_nasid = COMPACT_TO_NASID_NODEID(cnode);
102 
103 		/* Check if this node should get a copy of the kernel */
104 		if (cpu_isset(cnode, ktext_repmask)) {
105 			server_nasid = client_nasid;
106 			copy_kernel(server_nasid);
107 		}
108 
109 		/* Record where this node should get its kernel text */
110 		set_ktext_source(client_nasid, server_nasid);
111 	}
112 }
113 
114 /*
115  * Return pfn of first free page of memory on a node. PROM may allocate
116  * data structures on the first couple of pages of the first slot of each
117  * node. If this is the case, getfirstfree(node) > getslotstart(node, 0).
118  */
119 pfn_t node_getfirstfree(cnodeid_t cnode)
120 {
121 	unsigned long loadbase = REP_BASE;
122 	nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
123 	unsigned long offset;
124 
125 #ifdef CONFIG_MAPPED_KERNEL
126 	loadbase += 16777216;
127 #endif
128 	offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase;
129 	if ((cnode == 0) || (cpu_isset(cnode, ktext_repmask)))
130 		return (TO_NODE(nasid, offset) >> PAGE_SHIFT);
131 	else
132 		return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >>
133 								PAGE_SHIFT);
134 }
135 
136